You can choose a set of templates saved in your sandbox space by using an appropriate sandbox prefix. For example, if you want to preview a version of ទំព័រគំរូ:Test that you have saved as "អ្នកប្រើប្រាស់:Foo/sandbox/ទំព័រគំរូ:Test", use "អ្នកប្រើប្រាស់:Foo/sandbox" as the prefix.